Any scientist who tells you they know that GMOs are safe and not to worry about it, is either ignorant of the history of science or is deliberately lying. Nobody knows what the long-term effect will be.

More than a billion people lack adequate access to clean water.

Environmentalism isn't a discipline or specialty. It's a way of seeing our place in the world. And we need everybody to see the world that way. Don't think 'In order to make a difference I have to become an environmentalist.'

Japanese people cut their energy use by 25 percent immediately after Fukushima. They showed there was huge opportunity there. And instead, the government simply wants to get those plants up and running again.

For the sake of our health, our children and grandchildren and even our economic well-being, we must make protecting the planet our top priority.

Outright bans on plastic bags may not be the best solution, but education and incentives to get people to stop using them are necessary.

A book is like a single tree in a forest, in that it exists in conjunction with and because of a great many others around it.